This thing is amazing... it fits nice and snug on the tank and doesn't move around. It comes with a swab slot thinggy but the cover is so tight on the tank that iyou can't get a swab in there and if you can get it in there, you can't get it out... well; its hard to. It is still an amazing product. A+++++++++...

Conclusion:

i would give it an 11 but i can only give it a 10. Buy one!!!!!!!!!!...